package com.imooc.o2o.service.Impl;

import java.util.Date;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.imooc.o2o.dao.ShopDao;
import com.imooc.o2o.dto.ImageHolder;
import com.imooc.o2o.dto.ShopExecution;
import com.imooc.o2o.entity.Shop;
import com.imooc.o2o.enums.ShopStateEnum;
import com.imooc.o2o.exceptions.ShopOperationException;
import com.imooc.o2o.service.ShopService;
import com.imooc.o2o.util.ImageUtil;
import com.imooc.o2o.util.PageCalculator;
import com.imooc.o2o.util.PathUtil;

@Service
public class ShopServiceImpl implements ShopService{
	
	private static Logger logger = LoggerFactory.getLogger(ShopServiceImpl.class);
	
	@Autowired
	private ShopDao shopDao;

	@Override
	@Transactional
	public ShopExecution addShop(Shop shop, ImageHolder thumbnail) {
		//空值判断
		logger.debug("begin");
		if(shop == null) {
			return new ShopExecution(ShopStateEnum.NULL_SHOP);
		}
		try {
			//给店铺信息赋初始值
			shop.setEnableStatus(0);
			shop.setCreateTime(new Date());
			shop.setLastEditTime(new Date());
			//添加店铺信息
			int effectedNum = shopDao.insertShop(shop);
			if(effectedNum <= 0) {
				//抛出RuntimeException异常后，事务才会被终止，然后回滚
				throw new ShopOperationException("店铺创建失败");
			}else {
				if(thumbnail.getImage() != null) {
					//存储图片，使用shop的shopId来创建图片的目录，shopImg文件流来创建图片，
					//存储到相关的目录里面。然后把图片的地址存储到shop对象中
					try {
						addShopImg(shop,thumbnail);
					}catch(Exception e) {
						throw new ShopOperationException("addShopImg error" +e.getMessage());
					}
					//更新店铺的图片地址
					effectedNum = shopDao.updateShop(shop);
					if(effectedNum <= 0) {
						throw new ShopOperationException("更新图片地址失败");
					}
				}
			}
		}catch(Exception e) {
			logger.error(e.toString());
			throw new ShopOperationException("addShop error:"+e.getMessage());
		}
		return new ShopExecution(ShopStateEnum.CHECK,shop);
	}

	private void addShopImg(Shop shop, ImageHolder thumbnail) {
		//获取shop图片目录的相对值路径
		String dest = PathUtil.getShopImagePath(shop.getShopId());
		String shopImgAddr = ImageUtil.generateThumbnail(thumbnail, dest);
		shop.setShopImg(shopImgAddr);
	}

	@Override
	public Shop getByShopId(long shopId) {
		return shopDao.queryByShopId(shopId);
	}

	@Override
	public ShopExecution modifyShop(Shop shop, ImageHolder thumbnail)
			throws ShopOperationException {
		if(shop == null || shop.getShopId() == null) {
			return new ShopExecution(ShopStateEnum.NULL_SHOP);
		}else {
			//1.判断是否需要处理图片
			try {
			if(thumbnail.getImage()!=null && thumbnail.getImageName()!=null && !"".equals(thumbnail.getImageName())) {
				Shop tempShop = shopDao.queryByShopId(shop.getShopId());
				if(tempShop.getShopImg()!=null) {
					ImageUtil.deleteFileOrPath(tempShop.getShopImg());
				}
				addShopImg(shop,thumbnail);
			}
			//2.更新店铺信息
			shop.setLastEditTime(new Date());
			int effectedNum = shopDao.updateShop(shop);
			if(effectedNum <= 0) {
				return new ShopExecution(ShopStateEnum.INNER_ERROR);
			}else {
				shop = shopDao.queryByShopId(shop.getShopId());
				return new ShopExecution(ShopStateEnum.SUCCESS,shop);
			}}catch(Exception e) {
				throw new ShopOperationException("modifyShop error:"+e.getMessage());
			}
		}
		
	}

	@Override
	public ShopExecution getShopList(Shop shopCondition, int pageIndex, int pageSize) {
		int rowIndex = PageCalculator.calculateRowIndex(pageIndex, pageSize);
		List<Shop> shopList = shopDao.queryShopList(shopCondition, rowIndex, pageSize);
		int count = shopDao.queryShopCount(shopCondition);
		ShopExecution se = new ShopExecution();
		if(shopList!=null) {
			se.setShopList(shopList);
			se.setCount(count);
		}else {
			se.setState(ShopStateEnum.INNER_ERROR.getState());
		}
		return se;
	}

}
